Spark-ignition engine

About: Spark-ignition engine is a research topic. Over the lifetime, 4352 publications have been published within this topic receiving 66550 citations.

High resolution gas chromatographic determination of the atmospheric reactivity of engine-out hydrocarbon emissions from a spark-ignited engine

Abstract: The reactivities of engine-out exhaust hydrocarbon (HC) emissions in photochemical smog formation have been determined for three fuels (isooctane, an aromatic blend, and a gasoline) in a single-cylinder, spark-ignited engine. High resolution capillary GC was used to determine the mole fractions of the exhaust hydrocarbon species. Temperature programmed chromatography on a single capillary column was sufficient to separate the major exhaust species. A library of approximately 160 hydrocarbon species was used to identify typically 90–95 % of the HC species present. GC-MS was used selectively to verify peak assignments. The effect of engine operating parameters (fuel-to-air ratio, spark timing, and speed) on reactivity was examined. Engine operating parameters affect both total emissions [g/mile] and the specific atmospheric reactivity [g ozone/g HC emissions] of these emissions. Changing the operating parameters to control total emissions may not be as effective as expected in controlling the total reactivity [g ozone/mile] of the emissions because the specific reactivity can also change simultaneously. Effects of changes in operating parameters differ significantly as the type of fuel is varied. The ability to measure exhaust hydrocarbon species emissions accurately and quickly will increase in importance as reactivity-based emissions standards come into widespread use.

Mathematical Modeling of Spark-Ignition Engine Cycles

Abstract: A quasi-dimensional spark-ignition (SI) engine cycle model has been developed. In this model, combustion is modeled as a turbulent flame propagation process. During the combustion, it is assumed that the cylinder charge consists of unburned and burned gas zones. A computer code was developed to present a mathematical cycle model. By using this code for any engine running at specified conditions, parameters that characterize the combustion, cycle, and engine performance can be computed practically. The above-mentioned parameters for several engines having different geometry and running at different operating conditions are determined theoretically, and these predicted values are compared to experimental data in the literature. Good agreement between predicted and experimental results were obtained. Comparisons of predicted and measured results show that the presented model is reliable for analyzing the SI engine cycles.